>Where is lowmem_shrink called from? I only see shrink called from the
>bcache sysfs handler __bch_cache_set(). The return value isn't checked
>there.
>
>Up to now this function has only returns positive numbers.
>
>There isn't a place which check LMK_BUSY so maybe it's best to just
>return zero?
Hey Dan,
lowmem_shrink is assigned to a shrinker struct (include/linux/shrinker.h) and
called in do_shrinker_shrink() in mm/vmscan.c. That, in turn, is called and
checked in a few places in vmscan.c.
>From the comments in shrinker.h:
"It should return the number of objects which remain in the cache. If it
returns -1, it means it cannot do any scanning at this time (eg. there is a
risk of deadlock). The callback must not return -1 if nr_to_scan is zero."
//Snild
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